Osteological character variation in the ventral skull.

<p>* Frequencies—calculated by considering right and left sides separately. Ten specimens of each species were examined.</p><p>** Tooth counts—number of functional teeth on the single, unpaired premaxilla and both right and left maxillae. Figures represent means, followed by the range in parentheses. Five males and five females of each species were examined.</p><p>Osteological character variation in the ventral skull.